MCQ
Polluted water can be purified by using:
- AMicro-organisms
- BAlgae
- CPesticides
- DBoth A and B
Explanation:
Water pollution due to organic sources like pollution due to sewage can be prevented by treating sewage before passing into the watercourse, in sewage or effluent treatment plants (ETP).
Domestic sewage primarily contains biodegradable organic matter, which readily decomposes by bacteria, algae, and other micro-organisms, which can multiply by using these organic substances as substrates and hence reduce some of the components of sewage.
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$I.$ An Association of two species where one is benefitted and other remains unaffected is called mutualism.
$II.$ An interspecific association where both partners derive benefit from each other is called commensalism.
$III.$ A direct food relation between two species of animals in which one animal kills and feeds on another is referred as predation.
$IV.$ A relationship between two species of organisms where both are partners are
benefitted from each other is called symbiosis